The Ds has 4 capabilities .
1. Play original DS games.
2. Play GBA game cartriges.
3. PictoChat - Chat with people , around 100 feet range ( Up to 16 people )
4. Download Play - Play VS, CO-OP games whit friends ( AD-HOC )

Sry about the games I don't know much.S
EDIT.

I heard that MP has some difficult controls, but it has one of the beautifulest graphics on DS.
About Mario Kart? It's pretty fun, has Wi-fi ( Like MP ) up to 4 players.

The Ds has 4 capabilities .
1. Play original DS games.
2. Play GBA game cartriges.
3. PictoChat - Chat with people , around 100 feet range ( Up to 16 people )
4. Download Play - Play VS, CO-OP games whit friends ( AD-HOC )

Sry about the games I don't know much.S
EDIT.

I heard that MP has some difficult controls, but it has one of the beautifulest graphics on DS.
About Mario Kart? It's pretty fun, has Wi-fi ( Like MP ) up to 4 players.

It can do this too if you're a geek.
[MEDIA]http://www.youtube.com/watch?v=3SyHBxyZGqs[/MEDIA]

dont think of buying it do buy it, it has a lite up screen, touch screen, awesome games (its more fun if you get games frequently because u will eventually get bored if u have old games), can donload game that you dont have from friends, and you can play with people across the world with some games, trust me it is awesome

Getting a DS is an excellent idea. I have never regretted about purchasing mine.
I may sound like a marketing employee, but I can assure you that you will enjoy everything about the DS, especially some of the original games which are available.

animal crossing looks pretty good! i might have to pick that one up tomarrow.

anyways a good FPS for the DS is Brothers in Arms. but i beat it in one day and returned it to gamestop lol. still fun though.

also Theme Park is a fun relaxing game to play.

advance wars was okay as well but i ended up returning it after a few days because i was eager to try out different games, i bought that and brothers in arms with my DS with the money i got from my PSP. psp sucks btw.. lol